Table 1.

Final body mass, muscle mass, and muscle mass normalized to body mass for young and old Hsp25^+/+ and Hsp25^−/− mice in muscle function and running wheel groups.

		Hsp25+/+	Hsp25−/−
BODY MASS (g)
Muscle function	Young	23.9 ± 0.4	24.8 ± 0.3
	Old	31.2 ± 0.4*	32.2 ± 0.6*
Running wheel	Young	24.2 ± 0.2	23.7 ± 0.2
	Old	30.6 ± 0.7*	31.8 ± 0.5*
GASTROCNEMIUS MASS (mg)
Muscle function	Young	124 ± 3	124 ± 2
	Old	106 ± 2*	111 ± 3*
Running wheel	Young	119 ± 2	115 ± 2
	Old	102 ± 3*	101 ± 3*
GASTROCNEMIUS MASS (mg)/BODY MASS (g)
Muscle function	Young	5.0 ± 0.15	4.9 ± 0.18
	Old	3.4 ± 0.09*	3.4 ± 0.06*
Running wheel	Young	5.2 ± 0.03	5.1 ± 0.07
	Old	3.3 ± 0.05*	3.2 ± 0.09*

Values are mean ± s.e.m.; n = 8 for muscle function groups and n = 12 for running wheel groups

^*significantly different from young group, p < 0.05.